SC2GyroDSU-Windows

A DSU (Cemuhook protocol) motion server for the Steam Controller 2, ported to Windows from Steam-Controller-GyroDSU by dylangmarinus-stack, which targets SteamOS/Linux.

Streams gyro + accelerometer data (and buttons/sticks/triggers) from up to 4 Steam Controller 2 units over the Cemuhook UDP protocol, so any DSU-compatible emulator can use the controller's motion sensors.

Features

• Supports up to 4 Steam Controllers simultaneously (slots 0-3)
• Works via Bluetooth, USB-C, and the Proteus Puck dongle
• Automatic gyro bias calibration
• Compatible with Cemu, Ryujinx, Eden, and any other Cemuhook-compatible emulator

Quick start (prebuilt exe)

1. Double-click sc2gyrodsu.exe (or run it from a terminal to see logs).
2. Connect your Steam Controller 2 via USB-C, Bluetooth, or the Proteus Puck dongle.
3. Point your emulator (Cemu, Ryujinx, Eden, ...) at:
   • IP: 127.0.0.1
   • Port: 26760 (default) — use sc2gyrodsu.exe --port 26761 if 26760 is already taken by something like DS4Windows or BetterJoy.

Slot 0 = first controller, slot 1 = second, and so on.

CLI options

Flag	Description
--port N	UDP port to listen on (default 26760)
--expose	Listen on all interfaces, not just 127.0.0.1 (e.g. for another PC/device on your network)
--probe	List detected Valve HID interfaces and exit
--help	Print usage

Important: Steam interference

If Steam is running, Steam Input may claim the controller and rewrite its settings (including gyro mode) every few seconds. If you get no motion data:

• Close Steam entirely, or
• In Steam → Settings → Controller, disable Steam Input for the Steam Controller while using the DSU server.

The server re-sends its IMU-enable command every 100 ms, which usually wins the tug-of-war, but a clean setup is more reliable.

Building from source

Requires CMake 3.16+ and either Visual Studio 2019+ or MinGW-w64. hidapi is fetched and built automatically via FetchContent — no manual dependencies. The resulting .exe is fully standalone (statically-linked runtime and hidapi) either way — no Visual C++ Redistributable or other DLLs required on the end user's machine.

Visual Studio (x64 Native Tools prompt):

cmake -B build
cmake --build build --config Release

Output: build\Release\sc2gyrodsu.exe

MinGW (or cross-compiling from Linux):

cmake -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release
cmake --build build

A mingw-toolchain.cmake toolchain file is included for cross-compiling from Linux with x86_64-w64-mingw32-gcc/g++.

The same CMake tree also still builds on Linux (cmake -B build && cmake --build build, using hidapi's hidraw backend), so this fork stays upstreamable as a cross-platform version.

Run at startup (optional)

Press Win+R, type shell:startup, and drop a shortcut to sc2gyrodsu.exe in that folder. To hide the console window, launch it via a small .vbs wrapper, or use Task Scheduler with "Run whether user is logged on or not".

Controller profile (Cemu example)

controllerProfiles/controller0.xml is a sample Cemu Wii U GamePad profile pointed at 127.0.0.1:26760 — copy it into Cemu's controllerProfiles folder as a starting point.

What changed from the Linux original

• inc/platform.h (new): Winsock2/POSIX socket abstraction (socket_t, closesocket vs close, per-platform SO_RCVTIMEO, WSAStartup RAII), plus a portable narrow() for hidapi's wchar_t* serial numbers (the original reinterpret_cast breaks on Windows, where wchar_t is UTF-16).
• src/dsu.cpp: POSIX headers removed; recvfrom/sendto buffer casts and socklen_t handled per-platform; randId() uses std::chrono instead of clock_gettime/getpid, which aren't available on MSVC.
• src/hiddev.cpp: feature reports retry with a +1-byte buffer, since the Windows HID stack (HidD_SetFeature) requires the buffer to match the device's exact declared feature report length, which differs from hidraw.
• CMakeLists.txt: fetches hidapi via FetchContent, selects the winapi backend + links ws2_32 on Windows and hidraw on Linux; MSVC-compatible compile flags; statically links the MSVC runtime (/MT) so the .exe has no Visual C++ Redistributable dependency, matching MinGW's static linking.

Everything else — the HID protocol, DSU packet layout, axis mapping, and slot management — is unchanged from the original.

Notes

• Gyro auto-calibration activates when the controller is held still for ~2 seconds.
• Only motion data, buttons, sticks, and triggers are provided — no rumble.

License

MIT — see LICENSE. Inherited from the original project by dylangmarinus-stack; this port's changes are released under the same terms.